FILE - In this July 11, 2012 file photo, Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks in Houston, Texas. President Barack Obama and Republican rival Mitt Romney's campaigns traded accusations of lying Thursday, ratcheting up an already heated race for the White House. (AP Photo/Evan Vucci, File)

Associated Press
FILE - In this July 11, 2012 file photo, Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks in Houston, Texas. President Barack Obama and Republican rival Mitt Romney's campaigns traded accusations of lying Thursday, ratcheting up an already heated race for the White House.  (AP Photo/Evan Vucci, File)
FILE - In this July 11, 2012 file photo, Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks in Houston, Texas. President Barack Obama and Republican rival Mitt Romney's campaigns traded accusations of lying Thursday, ratcheting up an already heated race for the White House. (AP Photo/Evan Vucci, File)
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